Sains Malaysiana 40(7)(2011): 757–763

Corrosion Protection of Carbon Steel Using Polyaniline Composite with Inorganic Pigments

(Perlindungan Kakisan Keluli Karbon Menggunakan Komposit Polianilin dengan Pigmen Inorganik)

Ahmed A. Al-Dulaimi*, Shahrir Hashim & M.I. Khan

Department of Polymer Engineering, Faculty of Chemical and Natural Resources Engineering

Universiti Teknologi Malaysia, UTM 81310 Skudai, Johor, Malaysia

Received: 23 October 2009 / Accepted: 25 September 2010

ABSTRACT

Two inorganic pigments (TiO2 and SiO2) were used to prepare composites with polyaniline (PANI) by situ polymerization method. PANI and PANI composites with SiO2 and TiO2 were characterized using Fourier transform infrared spectroscopy and X-ray diffraction. The morphology of the synthesized pigments (PANI , PANI-SiO2 and PANI-TiO2) was examined using scanning electron microscopy. Samples were then used as pigments through blending them with acrylic paint and applied on the surface of carbon steel panels. Corrosion was evaluated for coating of carbon steel panels through full immersion test up to standard ASTMG 31. Mass loss was calculated after they have been exposed in acidic media. A digital camera was also used for monitoring corrosion visually on the surface of carbon steel specimens. The results revealed that acrylic paint pigmented by PANI-SiO2 composite was more efficient in corrosion protection for carbon steel compared with the other synthesized pigments.

Keywords: Composite pigments; corrosion protection; polyaniline

ABSTRAK

Dua pigmen inorganik TiO2 dan SiO2 digunakan untuk menghasilkan komposit dengan polianilin (PANI) dengan kaedah pempolimeran situ. PANI dan PANI komposit dengan (SiO2, TiO2) dicirikan menggunakan spektroskopi transformasi Fourier inframerah dan pembelau sinar-X. Mikroskop elektron imbasan digunakan untuk memerhatikan morfologi pigmen sintesis (PANI, PANI-SiO2 dan PANI-TiO2). Sampel kemudian digunakan sebagai pigmen melalui pencampuran dengan cat akrilik dan diterapkan pada permukaan panel keluli karbon. Kakisan dinilai untuk lapisan panel keluli karbon melalui perendaman penuh mengikut piawaian ASTM G31. Kehilangan jisim dikira selepas didedah kepada medium berasid. Kamera digital juga digunakan untuk pemantauan visual kakisan pada permukaan spesimen keluli karbon. Keputusan kajian menunjukkan bahawa cat akrilik berpigmen PANI-SiO2 komposit lebih cekap dalam perlindungan kakisan untuk keluli karbon berbanding dengan pigmen lain yang disintesis.

Kata kunci: Perlindungan kakisan; pigmen komposit; polianilin

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*Corresponding author; email: ahmed_kareem79@yahoo.com